Lubuntu 19.10
The yellow lines I quickly added using krita and very roughly show the locations of my screens in this screenshot (one is above the other and to the right)
I have three panels; top panel is hidden but right at the top my upper display. The bottom display has two panels, the bottom is always visible, the left panel is visible because I had my cursor over it, but provides buttons somewhat like Unity
I would expect if there was a competition for ‘pretty screenshot’, I’d get the ‘wooden spoon’ (aussie colloquialism for last place) but I find it fully functional 
For how to do it, see Chapter 5 Panel, Desktop, and Runner — Lubuntu Manual 23.10 documentation